Pump



g- 9, 1966 H. B. SCHULTZ 3,265,007

PUMP

Filed Sept. 25, 1964 2 Sheets-Sheet 1 INVENTOR.

ATTORNEY,

Aug. 9, 1966 H. B. SCHULTZ PUMP 2 Sheets-Sheet 2 Filed Sept. 25, 1964 sPmNe Aw.

INVENTOR.

D/SCHARGE FLOW.

HAROLD B. SCHULTZ A 7'TOR/VE Y.

United States Patent 3,265,007 PUMP Harold B. Schultz, South Bend, Ind., assiguor to The Bendix Corporation, South Bend, Ind., a corporation of Delaware Filed Sept. 25, 1964, Ser. No. 399,206 4 Claims. (Cl. 103-153) The present invention relates to a positive displacement pump, and more particularly to a valving arrangement therefor which is simple and compact.

One of the general problems with pumps of the same general type as described below is that of valve breakage due to a design having an unsupported flapper valve and in priming the pump due to excessive clearance volume. It is the main object of my invention to eliminate these problems.

Another object of the present invention is to provide a hydraulic pump with a stacked or concentric valve means for the ingestion of a hydraulic fluid and the pressurizing thereof prior to discharge to a means adapted to utilize same.

A further object of this invention is to provide a pump of the aforesaid type with a valve means that is very sensitive to any pressure dilterential to open and close same.v

A still further object of this invention is to provide a pump having the concentric valve means and a pressure responsive means for starving the induction chamber of the pump when a predetermined system pressure has been reached.

It is still another object of my invention to use a ring type inlet flapper valve acting over an annulus to provide a large flow area with only a small gap for the thin flapper valve steel to span.

Still further objects are to provide a large annular inlet area to permit short valve lift with adequate fluid flow path and small clearance volume for a pump.

Other and further objects will appear from the following description of the drawings in which:

FIGURE 1 is a schematic view showing a means to utilize the pump in accordance with the principles of my invention;

FIGURE 2 is a cross-sectional view of the pump designed in accordance with the principles of my invention;

FIGURE 3 is a blown-up, cross-sectional view of the valve means within the pump in accordance with the principles of my invention;

FIGURE 4 is an enlarged view of an intake flapper valve designed in accordance with the principles of my invention; and

FIGURE 5 is an enlarged side View of a flapper type discharge valve designed in accordance with the principles of my invention.

With particular reference to the drawings and in particular to FIGURE 1, I show a pump connected by a conduit 12 to a reservoir portion 14 of a power brake control valve structure 16, and by a conduit 18 to an accumulator 20 through a T-fitting 22 that also connects a conduit 24 with the power brake control valve 16 and the conduit 18 and accumulator 20. As seen, the pump 10 comprises a mounting bracket 26 adapted to be connected to an engine block for an associated vehicle in such a manner that a pulley 28 is operatively connected with a fan belt for the engine to drive the pump 10. The power brake control valve is of the split type so that independent pressures are provided conduits 30 and 32 for respective wheel cylinders 34 and 36 of the front and rear brakes of the vehicle mentioned.

As seen in FIGURE 2, the pump 10 is formed from a casting 38 having a boss portion 4-0 through which a shaft 42 extends to carry the pulley 28, so that rotary motion thereof will cause an eccentric portion 44 to reciprocate a connecting arm structure comprising an abutment link 46 having a cylindrical owning 48 receiving a wrist pin 50 that is biased thereto by a spring 52, which also functions as the return spring for a piston 54 mounted to the abutment link 46 by the wrist pin 50 through the medium of the spring 52 and spring retainer 56.

The piston 54 is adapted to reciprocate Within a flanged body 58 having a projection 60 and a sleeve 62 accurately sized to permit a close sliding fit of the piston therewithin. As seen, the flanged structure 58 is provided with a reduced diameter surface 64 over which a cup-shaped portion of a porting and hold-down member 66 is fitted and sealed with respect to the flanged body 58 and a cylindrical boss 68 of the casting 38. The cup-shaped porting and hold-down member 66 is further held in the aforesaid position by means of an end cap 70 threaded to the cylindrical boss 68 as at '72 to position the members 66 and 58 against a shoulder 74 of the casting 38.

As seen, the casting is provided with a cover 76 held thereto by means of screws 78 which cover also is provided With an inlet fitting 80 to connect the conduit 12 to the pump. Immediately under the cover I have provided a filter 82 to die-contaminate fluid flow from the reservoir to the pump and adjacent the filter the casting 38 is provided with an angled passage 84 leading to an inlet chamber 36 surrounding the cup-shaped porting and hold-down member 66. The member 66 is drilled as at 88 to provide an inwardly directed passage leading inwardly from the inlet chamber 86 to another radial passage 90 that terminates into an axial peripherally displaced passage 92 within the flanged member 58 that leads to a radial passage 94 directed inwardly thereof to a chamber adjacent the sleeve 62 to the pump chamber inlet controlled by an annular flapper valve 96 controlling the communication between passage 94 and pump chamber 98.

The pump chamber 98 is arranged to exhaust fluid through a central opening 100 in a spacer 102 located between the flapper valve 96 and a discharge flapper valve 104, which flapper valves are more particularly shown in FIGURES 4 and 5. The discharge flapper 104 is located to open into a discharge chamber 106 within the structure 58 that is open to a passage 108 in the cup-shaped porting and hold-down member 66, which passage 108 leads to a collection chamber 110 formed within the end cap 70 be tween it and the member 66. A movable retainer 112 having drilled openings 113 to permit fluid flow is biased by a spring 114 between the member 66 and the end cap 70 within the chamber 110 adjacent a discharge opening 116, end cap 70. To the retainer 112 I have connected a plunger 118 responsive to pump discharge pressure which is so arranged to reciprocate through the member 66 and cooperate with the central opening in the passage 88 of the member 66 to starve the passage 90 when the pressure in chamber 110 is above a predetermined value.

In operation, as the pulley 28 is rotated and the piston 54 is reciprocated to the right as viewed in the drawings, the flapper valve 96 will be drawn oil? of the surrounding seat in the flanged portion 58 to the limit of the spacer 104 and thereby allow fluid within the inlet passages and chamber of the pump 10 to flow into the pump chamber 98. Then upon further rotation of the pulley, the piston 54 starts reciprocating inwardly of the pump chamber to compress the fluid therein and force it into the axial opening 100 of the spacer after first causing the inlet flapper 96 to again seat upon the surrounding structure of the flanged member 58. The fluid within the central opening 100 will then bias the flapper 104 outwardly to exhaust fluid into the chamber 106 and consequently passage 108 to the collection chamber 110. This pressurized fluid will pass I) about the retainer 112 and to the exhaust opening 116 of the pump 10 to supply the accumulator 26 of the system as seen in the schematic view of FIGURE 1. When the accumulator pressure has reached a suflicient level, for example 1800 p.s.i., to provide adequate pressure for braking the vehicle, the fluid in the chamber 110 will act upon plunger 118 to oppose spring 114- and cause plunger 118 to move to the right or inwardly of the central opening in passage 88 and thereby curtail fluid flow from the inlet chamber 92 to the pump chamber.

The flapper valve design is of principal concern in that there is provided a spring arm which will allow minute pressure fluctuation to open the valve. This is due to the length of the spring arm provided for each of the flapper va-lves, which spring arm is shown more particularly in FIGURES 4 and 5 for the inlet and discharge valves, respectively, as at 120 and 122.

While the invention has been illustrated in connection with a specific type of pump, other applications will readily be apparent to those skilled in the art. It is not, therefore, desired that the invention be limited to the specific details illustrated, and it is intended by the appended olaims to cover all modifications which fall within the spirit and scope of the invention.

I claim:

1. For use in a reciprocating pump a means to control inlet and discharge flow comprising:

a pump casing having a shoulder formed internally thereof;

a flanged body having a portion thereof sized to abut on said shoulder, said flanged body being adapted to receive a pump piston in a central chamber thereof;

a porting and hold-down member sealingly connected to said flanged body on an end opposite that abutting said shoulder, said porting and holddown member having separate passages therein arranged to communicate with said central chamber;

a valve means operatively arranged between said flanged member and said porting and hold-down member to control communication between said central chamber in the flanged member and said passages in the porting member, which valve means includes,

a first circular inlet valve body having a horseshoeshaped opening circumscribing an annular valve disc supported by a single reed type stern member to said body to provide a long spring arm allowing said annular valve disc to fluctuate by a small pressure differential thereacross,

a second circular discharge valve body having a horseshoe-shaped opening circumscribing a solid valve disc suported by a single reed type stem to said body, to be centered by the opening in said annular valve disc whereby said inlet and discharge valve bodies may be operatively arranged between said flanged member and said porting member in concentric positions in stacked relationship, and

a spacer element arranged between said valves with appropriate openings communicating each valve with said central chamber such that suction in said chamber will open said annular valve disc and close said solid disc and pressure will open said solid disc and close said annular disc;

a means adapted to be connected with said casing and arranged to bias said porting member to said flanged member clamping said valve means in operative position therebetween; and

a pressure responsive member arranged in said casing to be operative by discharge pressure to close off said passage in said porting member communicated with the suction operated annular valve disc to starve said pump when said discharge pressure reaches a predetermined value.

2. A pump comprising:

a casing having means for mounting a revolving shaft and a pump bore;

a piston mounted for reciprocation into said pump bore as the shaft is revolved;

a flanged body arranged to abut a shoulder in said casing within said pump bore, said flanged body having a centrally drilled passage leading from the end abutting said shoulder to an open cavity at the other end and a sleeve mounted in said cavity to form a pump cylinder into which said piston reciprocates, said sleeve and said flanged member being spaced to form an annular opening about said sleeve with the edges of said sleeve and said flanged member being machined to form a valve seat on each side of said annular opening, said flanged member being further provided with a reduced diameter portion opposite the side abutting said shoulder about said cavity;

a porting member having an annular projection sized to fit over said reduced diameter portion of said flanged member, with an inlet passageway communicating an area between said casing and said porting member internally of same and thence to said annular space in said flanged member plus an outlet passage communicating a cavity in said porting member to a chamber behind said porting member between it and said casing;

a valve means in said porting member cavity to control communication of said annular space with said cylinder and said cylinder with said outlet passage, said valve means including,

a first circular valve body having a keyhole-shaped opening partially filled by an annular valve poppet and its reed-like supporting stem of predetermined length which stem is an integral part of said body, said poppet being arranged to seat on said machined portions of said cylinder and said flanged member so as to be opened by suction forces in said cylinder causing a pressure differential across said poppet to flex said stem and closed by pressure developed in said cylinder.

second circular valve body having a keyhole-shaped opening partially filled by a solid valve poppet and its flat reed-like supporting stem of predetermined length that is a part of said body locating said solid poppet concentrically of said annular poppet to seat a passage formed by the central opening in said annular valve poppet upon a suction force being created in said cylinder and to open same upon the development of a pressure force therein,

a spacer element between said first and second valve bodies which is centrally drilled and machined with a seat portion arranged to cooperate with said solid valve poppet, and

means to sealingly bias said flanged member and said porting member together in said pump bore against said shoulder and hold said valve means in its operative position therebetween.

3. A pump in accordance with claim 2 wherein said spacer means is constructed to limit the amount of opening for said annular poppet to prevent fatigue thereof while permitting the maximum flow opening.

4. A pump in accordance with claim 2 wherein said annular and solid poppets are constructed from wafer thin spring steel.

References Cited by the Examiner UNITED STATES PATENTS 2,603,533 7/1952 Rye 103l53 FOREIGN PATENTS 530,112 8/1953. Canada.

SAMUEL LEVINE, Primary Examiner.

H. F. RADUAZO, Assistant Examiner. 

1. FOR USE IN A RECIPROCATING PUMP A MEANS TO CONTROL INLET AND DISCHARGE FLOW COMPRISING: A PUMP CASING HAVING A SHOULDER FORMED INTERNALLY THEREOF; A FLANGED BODY HAVING A PORTION THEREOF SIZED TO ABUT ON SAID SHOULDER, SAID FLANGED BODY BEING ADAPTED TO RECEIVE A PUMP PISTON IN A CENTRAL CHAMBER THEREOF; A PORTING AND HOLD-DOWN MEMBER SEALINGLY CONNECTED TO SAID FLANGED BODY ON AN END OPPOSITE THAT ABUTTING SAID SHOULDER, SAID PORTING AND HOLDDOWN MEMBER HAVING SEPARATE PASSAGES THEREIN ARRANGED TO COMMUNICATE WITH SAID CENTRAL CHAMBER; A VALVE MEANS OPERATIVELY ARRANGED BETWEEN SAID FLANGED MEMBER AND SAID PORTING AND HOLD-DOWN MEMBER TO CONTROL COMMUNICATION BETWEEN SAID CENTRAL CHAMBER IN THE FLANGED MEMBER AND SAID PASSAGES IN THE PORTING MEMBER, WHICH VALVE MEANS INCLUDES, A FIRST CIRCULAR INLET VALVE BODY HAVING A HORSESHOESHAPED OPENING CIRCUMSCRIBING AN ANNULAR VALVE DISC SUPPORTED BY A SINGLE REED TYPE STEM MEMBER TO SAID BODY TO PROVIDE A LONG SPRING ARM ALLOWING SAID ANNULAR VALVE DISC TO FLUCTUATE BY A SMALL PRESSURE DIFFERENTIAL THEREACROSS, A SECOND CIRCULAR DISCHARGE VALVE BODY HAVING A HORSESHOE-SHAPED OPENING CIRCUMSCRIBING A SOLID VALVE DISC SUPPORTED BY A SINGLE REED TYPE STEM TO SAID BODY TO BE CENTERED BY THE OPENING IN SAID ANNULAR VALVE DISC WHEREBY SAID INLET AND DISCHARGE VALVE BODIES MAY BE OPERATIVELY ARRANGED BETWEEN SAID FLANGED MEMBER AND SAID PORTING MEMBER IN CONCENTRIC POSITIONS IN STACKED RELATIONSHIP, AND A SPACER ELEMENT ARRANGED BETWEEN SAID VALVES WITH APPROPRIATE OPENINGS COMMUNICATING EACH VALVE WITH SAID CENTRAL CHAMBER SUCH THAT SUCTION IN SAID CHAMBER WILL OPEN SAID ANNULAR VALVE DISC AND CLOSE SAID SOLID DISC AND PRESSURE WILL OPEN SAID SOLID DISC AND CLOSE SAID ANNULAR DISC; A MEANS ADAPTED TO BE CONNECTED WITH SAID CASING AND ARRANGED TO BIAS SAID PORTING MEMBER TO SAID FLANGED MEMBER CLAMPING SAID VALVE MEANS IN OPERATIVE POSITION THEREBETWEEN; AND A PRESSURE RESPONSIVE MEMBER ARRANGED IN SAID CASING TO BE OPERATIVE BY DISCHARGE PRESSURE TO CLOSE OFF SAID PASSAGE IN SAID PORTING MEMBER COMMUNICATED WITH THE SUCTION OPERATED ANNULAR VALVE DISC TO STARVE SAID PUMP WHEN SAID DISCHARGE PRESSURE REACHES A PREDETERMINED VALUE. 